How to detect when the delete key is pressed on the keyboard?

问题

I want that when the Del key is pressed a certain function is called. How can I achieve that using getch() if possible or otherwise some nested getch() calls?

回答1:

The function _getch() returns an "escaped" value for cursor and page control keys. For the keypad and the function keys, that is 0 followed by the key code, for other keys it is 224 followed by the key code.

#include <stdio.h>
#include <conio.h>

#define ESC     27
#define ESC1    0
#define ESC2    224

int main()
{
    int d=-1, e=-1;
    printf("Press a key (Esc to quit)\n");
    do {
        d = _getch();  
        if (d == ESC1) {
            e = _getch();  
            printf("%d %d\n", d, e);
        } else if (d == ESC2) {
            e = _getch();  
            printf("%d %d\n", d, e);
        } else {
            printf("%d\n", d);
        }
    } while (d != ESC);
    return 0;
}

Running the program and pressing three keys Delete, Del(keypad), Esc produces the output

Press a key (Esc to quit)
224 83
0 83
27

Of course, Numlock must be Off.

回答2:

You should look for this function kbhit() .It is basically for keyboard hit and look for del key ascii code and match with that .

来源：https://stackoverflow.com/questions/34451998/how-to-detect-when-the-delete-key-is-pressed-on-the-keyboard